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kernel
FreeDOS kernel - implements the core MS-DOS/PC-DOS (R) compatible operating system. It is derived from Pat Villani's DOS-C kernel and released under the GPL v2 or later. Please see http://www.freedos.org/ for more details about the FreeDOS (TM) Project. (by FDOS)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You might find the source code for FreeDOS of interest for learning more about how the low-level access to the interrupt services worked. Specifically, console.asm installs a character write routine (which calls BIOS INT 10h under the hood).
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